Material for protecting ironwork and method of preparing same.



UNITE STATES j Patented December 29, 190B.

PATENT OFFICE.

MATERIAL FOR PROTECT ING IRONWORKAND METHOD OF PREPARING SAME.

. SPECIFICATIONforming part of Letters Patent No. 748,270, dated December 29, 1903.

Application filed June 14,1902.

To all whom it may concern.-

Beit known that I, WILLIAM O. EMERY, a citizen of the United States, residing at ()rawfordsville, in the county of Montgomery and State of Indiana,have invented a new and useful Material for Protecting Ironwork and Method of Preparing Same, of which the following is a specification.

This invention relates to a composition of matter to be used as a protective coating for iron or metal work.

The especial object of this invention is to provide a material which will form a substantially impervious, durable,and substantially indestructible coating for iron or metalwork, cables, 850., having little or no conductive capacity for electricity.

To this end this invention consists of a compound resulting from the union of asphalt with a complex silicate and aluminate of calcium and sodium. l

One of the most serious problems in the protection of all classes of ironwork, especially in maintaining underground conduits-,-

such, for example, as gas-piping, water-piping, or conduits for carrying electric wiresis the prevention of corrosion, and especially the protection of structures of this class from electrolysis. This is especially the casein locations where trolley-currents are employed or connection which is liable to be made with other powerfulelectric circuits. In practiceit is now customary to coat ironwork of this class with asphaltum paints or other similar compounds. The protective coatings which have heretofore been employed, however, have ordinarily depended for their efliciency upon the resistance of the asphaltum or other material of this class to the transmission of electricity, and while asphalt-um and materials of this class are ordinarily poor conductors of electricity yet when exposed to the action of strong electric currents the asphaltum quickly breaks down and does not maintain perfect insulation.

As distinguished from protective coatings relying upon their resistance of asphaltum or similar material I have provided a material t'or protecting ironwork which will secure a permanent insulation of the ironwork to which it is applied as a coating by reason Serial No. 111,679. (No specimens.)

of the presence of the silicates of calcium and sodium with an aluminate of calcium.

. sodium, together with an aluminate of calcium, both of which are chemically associated. This complex substance I prepare by fusing at white heat qnicklime, quartz, feldspar, alumina, sulfate of soda, and charcoal, in such proportions as will at said White heat yield a clear highly-viscous mass. In some cases I have omitted the charcoal; but the'presence of charcoal I have found to be desirable, as the same reactswith the sulfate of soda, although the charcoal does not enter into the finished product When the resulting flux has cooled, it is crushed, powdered, and bolted, giving a grayish-White impalpable powder. variation may be allowed in the proportion of the materials employed, the resistant powder varying from that which may have a formula (Na O,K O).OaO.6SiO to a powder which would have substantially the formula 5(Na O,K,O).7CaO.37SiO which two formules, it is to be understood, outline the extent of variation to which the constituents are subject. The oxide of soda and potassa may alternate or replace one another without apparent effect on the general character of' the mass, (at least for the purpose of this invention.) The alumina introduced replaces a proportionate amount of calcium oxid in the formulae cited and appears to form an aluminate of calcium in the end, and it is to this that the resistant quality of my compound is largely due. In addition to theingredients noted in the formula given the finished material usually contains small In practice considerable bles, metal-work, &c., upon which it is to be used as a protective coating.

In some cases instead of applying my compound while melted it may be applied through partial solution in wood-alcohol, naphtha, or gasolene, although I prefer to apply the same hot in small Work, preferably dipping the iron or metal parts to be protected directly into a bath of the molten compound.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. A material for protecting iron or metal work, cables, and for similar purposes, consisting of asphalt as a matrix carrying a resisting material, comprising silicates of calcium and sodium and an aluminate of calcium.

2. The method of preparing a protecting material for iron or metal work, cables, and for similar purposes, which consists in fusing at white heat quicklime, quartz, feldspar, alumina, and sulfate of soda in such proportions as will, at said white heat, yield a clear, highly-viscous mass, crushing the resulting flux to a powder, and adding said powder to melted asphalt.

3. The method of preparing a material for protecting iron or metal work, cables, and for similar purposes, which consists in fusing at white heat quicklime, quartz, feldspar, and alumina in such quantities as will yield, in the presence of carbon, a clear, highly-viscous mass, crushing the resulting flux to powder, and adding said powder to melted asphalt, the temperature of which is raised 'WllllB said powder is being added.

WILLIAM O. EMERY.

Witnesses:

M. E. CLODFELLER W. D. GRIFFITH. 

